RE: ASP 52 is a high torque engine
That seems a little high to me as well. Here are some numbers on the ST90 from the tach forum
ST G90 -
MA Scimitar 13x6
10,500 RPM
SuperTigre G .90
Fuel Fox 5%/20% castor.
Plug==GloDevil 2c
Prop==APC 14x6
RPM==10,590
That puts the ASP just 500rpm or so of a ST 90.
IMO a 14X6 on that engine is too much prop.